Taking 'faith' to mean: an effective trust or acceptance of the veracity of certain statements of fact, or the truth of existential claims. I.e. the kind of faith/beliefs that are cardinal to the worldview, or the "ism's" one subscribe to. Eg: "he takes it on faith that Math is sound", "she can sleep soundly in the faith the sun will rise tomorrow", or Wittgenstein's "hinges" below (thanks @Conifold).

I seems to me that there are many conditional beliefs we cary for the sake of day to day functioning. We don't contemplate "cogito ergo sum" everyday, but I could hardly hold down a job without some faith in a future benefit from its proceeds. We a all have what we think of as our worldview, but only some actively work to adjust our view. Regardless our efforts to improve, or simply leave most of our understanding to contingency, we all have an idea of what we would call fact and faith.

What would the minimal statement of faith be, could we assert: "I have no faith"?

EDIT: Though I haven't expressly excluded (with reason), religious statements such as "God is doing all of it", those tend to trivialize the question somewhat. So I'll request that answers on the religious vein be kept to something that are at least to some degree rationally rooted, i.e. it can be reasoned about within the broader context of 'purely rational' answers.

Do you mean "faith" as "belief without proof" and not as "religious belief"... I think.
– Mauro ALLEGRANZADec 29 '18 at 10:25

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If so, from a metaphysical point of view, quite all our "everyday beliefs" are "by faith".
– Mauro ALLEGRANZADec 29 '18 at 10:26

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In Peirce's paraphrase of Bane, "belief is that upon which is prepared to act". So the minimum is not a statement, but action. When verbalized, Peirce called such non-propositions "indubitables", and Wittgenstein called them "hinges":"We just can’t investigate everything, and for that reason we are forced to rest content with assumption. If I want the door to turn, the hinges must stay put", see IEP.
– ConifoldDec 30 '18 at 4:09

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I’m curious what sort of statements you would consider to not be statements of faith. Every noun you use assumes that there is something to which that noun refers to, and each verb assumes that a corresponding action “exists”. (Otherwise, your statement is meaningless, in which case I worry that it’s not even a statement.) Maybe interjections would not count, though they often assume that there is someone to hear them being said, even if that “someone” is yourself. Almost all sentences inherently state some sort of faith about what exists in the world.
– Pro QDec 31 '18 at 9:25

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@ProQ You give a good overview of one extreme of the problem I'm thinking about. That other extreme being someone that claim to have no faith, which is of course not impossible since the that view would require, at the very least, a belief that something can actually be self-evident. So then the problem is: does there exist a formal/normal minimal acknowledged 'faith set', and how could it be established?
– christo183Dec 31 '18 at 14:00